N. M. Adèle, K. S. T. Alain, K. Romanic, F. H. Bertrand, and E. Z. Bernard, “Effect of Fractional-Order on the Dynamic of two Mutually Coupled van der Pol Oscillators: Hubs, Multistability and its Control”, DNC, vol. 9, no. 1, pp. 83–98, Aug. 2026, doi: 10.5890/DNC.2020.03.007.